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> ./llil2vec big1.txt big2.txt big3.txt >f.tmp
llil2vec start
...
total        wall clock time : 5 secs

> diff f.tmp vec.tmp

> For some reason, short string version is faster when compiled with c
+lang++
> (while long string version is not)
...
total        wall clock time : 3 secs

> diff f.tmp vec.tmp

// llil2vec.cpp.
// Vector version of llil2grt.pl.
...

   return 0;
}

// llil3vec.cpp.
// Vector version of llil2grt.pl.
...

   return 0;
}

> g++ -o llil3vec -std=c++20 -Wall -O3 llil3vec.cpp
> time ./llil3vec big1.txt big2.txt big3.txt  >f.tmp
...
sys     0m0.465s

> diff f.tmp vec.tmp

// llil3grt.cpp.
// Inspired by llilgrt.pl: improve sort performance via a negative cou
+nt.
...

   return 0;
}

// llil3m.cpp. C++ 11 version of Perl llil.pl.
// C++ version inspired by Mario's famous dualvar two-sort Perl soluti
+on.
...

   return 0;
}

llil3grt (fixed string length=6) start
   - openmp version
...
real    0m4.752s
user    0m4.241s
sys     0m0.511s

$ time ./llil3m big1.txt big2.txt big3.txt  >f.tmp
llil3m (fixed string length=6) start
...
real    0m4.713s
user    0m9.238s
sys     0m0.679s

llil3m (fixed string length=6) start
   - openmp version
...
real    0m4.182s
user    0m6.128s
sys     0m0.473s

$ time ./llil3m big1.txt big2.txt big3.txt  >f.tmp
llil3m (fixed string length=6) start
...
real    0m4.784s
user    0m4.232s
sys     0m0.551s